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Yamaha YPVS smoking

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shaggy916
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Joined: 09 Aug 2010
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PostPosted: 05:13 - 12 Sep 2010    Post subject: Yamaha YPVS smoking Reply with quote
When I fire my PV up from cold the left hand pipe smokes more than the right both pipe get hot and it stops when the engine is up to temp. Is this just one of those things we have to live with or is there something wrong, I'm running autolub and both pipes look to be getting oil through them.

Stu
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bootsbiker
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PostPosted: 06:57 - 12 Sep 2010    Post subject: Reply with quote
what bike btw????????????
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hmmmnz
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PostPosted: 07:04 - 12 Sep 2010    Post subject: Reply with quote
bootsbiker wrote:
what bike btw????????????
he has pretty much given it away with his question

its ypvs so its a modern 2 stroke with powervalve,
and its got 2 exhausts, so its a twin,
that pretty much narrows it down the a rd/rz 250 or 350
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Robby
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PostPosted: 08:39 - 12 Sep 2010    Post subject: Reply with quote
As long as the smoke clears once warm and it runs ok, I wouldn't worry. The left hand pipe sits lower when on the sidestand, which can mean that more stuff can collect if anything is leaking down through the engine.

Possible causes are the choke sticking a bit on that side, more wore on that cylinder, a slightly knackered plug or a host of other minor things.

Ignore it, it's not a problem now and can only be properly diagnosed when it really becomes a problem.

Another thought - if you park it in the same place every day and the left hand side is in shade, then that pipe is colder and so can collect more condensation. Smoke on startup is often just condensation, only takes a very small amount of water to make noticable steam (which looks like smoke) for quite a long time.
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bootsbiker
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PostPosted: 10:06 - 12 Sep 2010    Post subject: Reply with quote
i kind of guessed. Just thinking of my RD in bits
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MarJay
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Joined: 15 Sep 2003
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PostPosted: 10:09 - 12 Sep 2010    Post subject: Reply with quote
Robby wrote:
As long as the smoke clears once warm and it runs ok, I wouldn't worry. The left hand pipe sits lower when on the sidestand, which can mean that more stuff can collect if anything is leaking down through the engine.

Possible causes are the choke sticking a bit on that side, more wore on that cylinder, a slightly knackered plug or a host of other minor things.

Ignore it, it's not a problem now and can only be properly diagnosed when it really becomes a problem.

Another thought - if you park it in the same place every day and the left hand side is in shade, then that pipe is colder and so can collect more condensation. Smoke on startup is often just condensation, only takes a very small amount of water to make noticable steam (which looks like smoke) for quite a long time.


Robby is correct, they do do it a bit, but sometimes a worn main jet can cause the same issue. I had that on my RD350LC, so I bought a carb rebuild kit and it was much better afterwards.
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bootsbiker
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PostPosted: 10:28 - 12 Sep 2010    Post subject: Reply with quote
MarJay wrote:


Robby is correct, they do do it a bit, but sometimes a worn main jet can cause the same issue. I had that on my RD350LC, so I bought a carb rebuild kit and it was much better afterwards.



how much did that cost
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MarJay
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PostPosted: 10:58 - 12 Sep 2010    Post subject: Reply with quote
bootsbiker wrote:
MarJay wrote:


Robby is correct, they do do it a bit, but sometimes a worn main jet can cause the same issue. I had that on my RD350LC, so I bought a carb rebuild kit and it was much better afterwards.



how much did that cost


I don't remember exactly, about £15 or something? Just search ebay for it. The pain is you have to remove the carbs and take them apart to fit the kit, but its not too bad a job.
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MarJay
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PostPosted: 15:50 - 12 Sep 2010    Post subject: Reply with quote
Vincent wrote:
Robby wrote:


Possible causes are the choke sticking a bit on that side, .


the choke is only on one side which could explain the smoking in the first place.


There is a vacuum tube that goes between carbs that enables the choke on both carbs when the plunger is pulled on the left hand carb. The bike wouldn't run very well if the choke only worked on one side!!!
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MarJay
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PostPosted: 17:21 - 12 Sep 2010    Post subject: Reply with quote
Vincent wrote:
MarJay wrote:


There is a vacuum tube that goes between carbs that enables the choke on both carbs when the plunger is pulled on the left hand carb.


Interesting, How does that work Question


No idea, but it does. I'd guess it taps off vacuum from the left cylinder to pull the choke plunger in the right.
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Frost
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Joined: 26 May 2004
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PostPosted: 20:08 - 12 Sep 2010    Post subject: Reply with quote
I've known 4 strokes smoke out of the left side pipe after being on the side stand. This being the cause of the problem was actually pointed out to me by a guy who owned an RD!
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shaggy916
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PostPosted: 20:51 - 12 Sep 2010    Post subject: Reply with quote
Cheers for all that lads I'll try putting on paddock stand overnight and see if that makes a difference. Stu
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m3-paul
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PostPosted: 21:02 - 12 Sep 2010    Post subject: Reply with quote
My TZR250 does exactly the same. If you are worried then simply pull the plugs and check the condition against each other. My plugs are a nice dark biscuit brown. Bike runs strong and once warmed up smokes very little, even when being revved a fair bit.
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